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Epidemic typhus infection in cynomolgus monkeys (Macaca fascicularis)

J C Gonder, R H Kenyon, C E Pedersen

    Infection and Immunity
    |October 1, 1980
    PubMed

    Insights

    Researchers developed a nonhuman primate model for epidemic typhus using cynomolgus monkeys. This model mimics human Rickettsia prowazekii infections and aids vaccine development.

    Area of Science:

    • Infectious Diseases
    • Primate Models
    • Microbiology

    Background:

    • Epidemic typhus, caused by Rickettsia prowazekii, poses a significant public health threat.
    • Lack of suitable animal models hinders understanding of R. prowazekii pathogenesis and vaccine development.

    Purpose of the Study:

    • To establish a nonhuman primate model for studying Rickettsia prowazekii infection.
    • To evaluate the utility of cynomolgus monkeys for R. prowazekii vaccine efficacy studies.

    Main Methods:

    • Cynomolgus monkeys (Macaca fascicularis) were intravenously infected with Rickettsia prowazekii.
    • Clinical signs, pathological changes, and hematological/biochemical parameters were monitored.
    • Histopathological examination of tissues, including brain, was performed.

    Main Results:

    • Infected monkeys exhibited clinical signs and pathological findings consistent with human epidemic typhus.
    • Elevated leukocyte counts and serum enzyme levels (alkaline phosphatase, blood urea nitrogen, glutamic pyruvate transaminase) were observed.
    • Typhus nodules were identified in the brains of deceased monkeys.

    Conclusions:

    • The cynomolgus monkey serves as a relevant nonhuman primate model for Rickettsia prowazekii infection.
    • This model is valuable for investigating epidemic typhus pathogenesis and evaluating R. prowazekii vaccines.

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